后处理方法对纳米介孔SiO_2形貌结构的影响  

Influence of post-treatment on structure and morphology of mesoporous silica nanoparticle

作　　者：杨应娟[1,2] 何文涛[2] 黄金[1,2] 于杰[1,2] 

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]国家复合改性聚合物材料工程技术研究中心,贵阳550014

出　　处：《化工新型材料》2014年第5期138-140,共3页New Chemical Materials

基　　金：贵州省省工业攻关[黔科合外GY字(2013)3033];贵阳市科技计划项目[筑科合同(2012HK)209-20]

摘　　要：采用十四烷基三甲基溴化铵作为表面活性剂,四乙氧基硅烷(TEOS)为无机硅源,在碱性条件下合成纳米介孔SiO2(MSN),并采用回流和煅烧两种不同的后处理方法去除表面活性剂,探讨了不同的后处理方法对纳米介孔SiO2结构形貌的的影响。通过红外、小角X射线衍射、低温N2吸附与脱附以及透射电镜检测。实验表明:回流和煅烧都能得到粒径在100nm左右的圆球状的介孔SiO2,煅烧得到的纳米介孔SiO2的BET比表面积、BJH孔径和孔容均大于回流法得到的样品,且通过小角XRD显示,煅烧得到的材料具有一定的长程有序性,而回流法得到的材料则是完全无序的,并通过TEM证实,煅烧比回流得到的样品的孔结构清晰,有序度高。Mesoporous silica nanoparticle（MSN）has been prepared at alkaline conditions by using myristyltrimethylammonium bromide as surfactant and tetraethoxysilane（TEOS）as the inorganic silicon source.The effect of two different post-treatment methods,reflux and calcination,on the structure and morphology of the nanoparticle were systematically investigated by infrared spectroscopy,small angle X ray diffraction,N2adsorption and desorption and transmission electron microscope.The results demonstrated that the nanosparticle with size about 100nm can be obtained by both post-treatment methods,and the calcified MSN showed larger BET surface area,BJH pore diameter and volume than the refluxed sample. Besides,from the SAXRD results the calcified materials showed low long-range order while the reflux material was completely disordered which confirmed by TEM.

关 键 词：结构形貌 回流法 煅烧法 纳米介孔二氧化硅 

分 类 号：TQ127.2[化学工程—无机化工] TB383.4[一般工业技术—材料科学与工程]